Days Set Up
Monday, Thursday
Analytic Time

7 - 15 days

Soft Order Code

Test Updated:


CD203 Antibody
Anti-FcER1 Antibody

Looking to order a test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

Flow Cytometry

Test Usage

Approximately 40% of patients with chronic urticaria have antibodies to the high affinity IgE receptor (FceR1). Sera from patients with chronic urticaria significantly upregulate basophil CD203c expression as measured by flow cytometry.

Reference Range

0 - 12

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in a red top tube. Centrifuge, aliquot serum into a plastic vial within 1 hour of collection and refrigerate up to 7 days or freeze for longer storage.

Red Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum

Billing Information

CPT Code
88184, 88185 x2
Pro Fee Code

Have More Questions?

Explore our helpful billing resources:

Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.